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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf076ee3cbc3ba9da0dc5d507e9fe99a9eeaa20d108dd4991e17dc4db93532c' 
  AND token = 'EyYpMKaOFpE8NbbROEki56U9+2B6y5pKymMRa0j5PEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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