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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e121b4d0f54d67d24ce1e6d983790332b672483d4e1a64374192f46efad6bd' 
  AND token = 'vivu3SXAPMRtJQUr4H/8/3qV+/c3/hPvpn1QumKFsEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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