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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ebf81db4f273d624dd2f370f920d195a6706efbdc543f205deb3f4d7412965' 
  AND token = 'ukQ00FT/YXel4rOKbrG2Kx7KF484mlatuOyqLZjjB+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}