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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b15b5d5e9b62d2e2065122ad3b509a48a6ec373cdfa42c8ec9ee364fcfeb8d' 
  AND token = 'ec8wNkpfrD2kDoSy7fEQ1G3dK6HL/qrCbnkDGmY/mkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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