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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa99fa4597a560fcec03dafe13df376602a52a063fa8c75e54ad55cd5706b821' 
  AND token = 'VeLVDitjK2VrJ5ecpm+Vw9fJxRPgX1sehD8WfzABqgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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