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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c271cc21675dd36847c015339ff7481b767de6910db4ea9ba8c0ecd1c8c7f62' 
  AND token = 'mvP/bqdvDbxPzUCcoZwbEqq+/NktYy2GYY7rNuq8GSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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