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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee01783c13d680cbba48ec9a772ad32f94ae9f74f79c7b305b0a85b0a775a42d' 
  AND token = 'byeMctsMeg4R6hSG948Vpw0SCLlpB1hbyXxk1Rs8QoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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