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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e523930d7e048b0cc66b5c3aceb734ed7031bded130370eb9f02f67fe0f35c' 
  AND token = 'n/zPat43Hadip3nH4dZgL5wC8KfPq02fvyd6KT/KF58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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