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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934d616eba661e02a4c1e5e011622a6bba5cee649df507f32dd50800c4d548a5' 
  AND token = 'yE7tixBU5MVmRpwx2ihVF5UCsTjf3zWtFCL6aMcZbtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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