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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3316a4d2d589af687d16fdddf5722c61073bda7cfaeb8d7e5aef3b65dcda73b' 
  AND token = 'VjDEcWzp3fHK0+zy908XZ8xktq2ntJZqUiDY84PDcQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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