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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0dcc8f98ec4b17813f9f20e38c86dcd8af17eab98fbedb6ef1e6a75704c5e2d' 
  AND token = 'Ry+2fTIdNTJE5SkKDYCRfkTB9Pd+Kmxx1yvpkL8S9rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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