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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2e18dc69d6b2e8d8c4cbce4502fc37e60cb2b7eff01b70fd21b4721dba0f79' 
  AND token = 'bugdPd4ZSRbr0cNEyW9/BPYsV/ciQZ6VS97K/R/ZksE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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