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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ac2b641002f29bac3c917329f3445423968d2027d4b0a0c5b08e380e52e6ee' 
  AND token = 'T4k8diPzKzf7JsDiTCNS+ACYfk2tTJLs0A4gMarHVM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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