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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea3a6cb5f4ca0eb5ddb75c6e6765937751781b8c825bfd3badccc4c54edea7e' 
  AND token = 'Mf+snyfqgukpAGWief/sLB41JXXvwXB4D2ropt3Ghr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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