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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3372e569518efdb03bc695f2ed4225124fbf36d8da3f30f86b6e49da2919fd' 
  AND token = '6Ru2f+sR5X2S2n6FJ6ouk60+8iV+c19UdzvdH5FC43s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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