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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbcc59a43d9fc9bbcbf3965b27fe435fa51763e88f2f1c11eba07a3c90b70b6' 
  AND token = 'cd10VqkKQXm4jfIqnJx9z4paoOdreQFEYUcWb1yx6Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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