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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f89910af6a7c20193ce3b2faa912519ed9c1978d2fdd9bff0a86f077ce74ed' 
  AND token = 'uRjekYK0Bwc3XPBhFtLg9e7Zzh6PspRUeYmuXoCQjz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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