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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4510e4262efc9e73021d5da30849d693ad56ffc181cd12326073007f06f24c7' 
  AND token = 'pSHtODh6TCxCT0YJUVCeL981H8Nt1YCk52QhHNPA19E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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