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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da4f323e8416f019ae04f853ebc3d65c8623224821213003d00079b530d7092' 
  AND token = 'Nz5L9KwsmSfBdoZ83K6QFp+fksusmrZYUzUld3g50Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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