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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40978e885aa15dcabf047dd098cb59c72a047b3e4670100e003a4c14d9acc6a' 
  AND token = '6ZTDiLMfTOQ2fpopN1GAp9OPGMbJ2ung/S4KDHsHvIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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