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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2ec40d404341ffbbe595c90af86b239fc4b8df43a8d97ea309740e7b33c90d' 
  AND token = 'lX2lDe8ppFHoBJbUxprqTAylg4k1DWek1DrJNNlJURI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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