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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b1cd265e52285574092e0c1847ddfa4a25dd6de33312fb2c54d0af56f44a09' 
  AND token = '1062AE82Gvs2j6m4lCwFvseUFKK9TG37lF2F2iP2Ogg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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