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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2f67175e0ecd92b4f0610e012f0fe93d66806c02c4fcca445beea672aa0956' 
  AND token = 'Wa14dkJWv6n8tZzlw9MusJwu/FYne/4wzye5Xh4444I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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