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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6030fbd41bc850837f6194f5a76de4b919e01d7cbae5b7e57908dc528ba1f59' 
  AND token = 'ZQnWtk4p3/OgSJLUIrxfLI2UsIMOd6PFKU2vb+ffb78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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