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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f45d50cecc143ef835b2027420e9b61e2c7907902fe4604bf97a37d3045750' 
  AND token = 'cE3xk/v682wA6mU32zcAxHgRdEh10Cj83Xk6IhyiTaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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