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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7ea02af02fe6667f4b4ece9e6cd7496b446c0b6076606eb98692d739b22a90' 
  AND token = '4RhLVw00SI6rgUS7bBn8yKZLqxjj0+HSIAS9n1hqHrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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