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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3c84020fbcdd557e8247c4dd4ad06fc13cd99192a1e8b0a3493222e5a29f58' 
  AND token = 'OSxFGYZUFzJs0CIWbs617ul22KpnLv8QQe/sB2uBLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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