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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a411a372649254b7c3be3d72fb0f6cff3606a5399035d129d6a12d235a200c9' 
  AND token = 'F58eKdn0oqVvj6esFYoDbNkBR32ideaDI44HFhplhMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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