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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265112c2b780df9e30b3b1b16666c7bf16d699c2a97aeeb739358282ce90258d' 
  AND token = '6LGSqbzkhDLViOn8FsDG1ItRKnwU5aK2bmoAcuE615s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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