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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b87adc4c86cce704ac41845a4f578b16b317ce95013cd3c9884f7bf43492a7c' 
  AND token = 'EkS39VyYLEgDvbkQI1gyFb1GXznIK26ztbklOmbKVcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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