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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bce8b6f764d0b29522db0befac856e682194d9298db1a3198dd04ba455d7a82' 
  AND token = '5c3D6FeVgbq2SUEw8siCrdYJKpUfiE+A7esWyFc9Qa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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