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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ddd11ba536a1bc9f86e8abad0fabe1306f8fdacb8e45b1d89140e89405ecea' 
  AND token = 'R6v2yR+8ov7sNOjh712ayvED+RIygN/8EYfdGnsf/EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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