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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eca54e56cd4981dfa17b08a0ca034f86e8d9a2674d8edd220c33817c123de1a' 
  AND token = '3TDzVwhhDRM4KLVFCKFgNlH1JH/DOkAau1i83F1K3Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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