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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03bbec5272f690ffec3790c4fd38cfc9a0e3a9eded1fa43e27d3315beb53088' 
  AND token = 'eRkwaJ0tvK2+cIuw2CsTOnTXbMA7p3Kv/g25RTd//SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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