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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4037de6a1ff7e34b28ae895b0ae665f5542623a3ac58e12c695b2121280e6f' 
  AND token = 'YoKhNfa1Cg92N1wKuSPZxjLjTlhhHQFnZf8yUsjbvUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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