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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7f3aaab7f0c9233fa3f3f102c4cb1cfb7e6aefc78f73b0e99c66c7ad34d5f8' 
  AND token = 'hv3ERL3w873RCRkvjUz7nTjOkJ5kmtd+3ABx0d2G0xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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