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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16d2fcea6ded43aaf9e780a013713599aa9fc64e4c76b85aadd0d72cc824b30' 
  AND token = 'I4cz5WSNZW150NOeQQ3unz/yQGG9y+BUpD39AQ/O9vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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