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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3addf4e543e9c96f890b57a92d34f841af1d0083e531b035b78ea77a3710947a' 
  AND token = 'npi+Ff8vlfDC3V+FNRWAMBp2/GQx3/Qw+p+x0SnLkxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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