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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849f1190d80e863d3abdb6081b5e7adba7fb720146026f74711d7610ce12c262' 
  AND token = 'vAyp2VMJfxGpGzkIA5yicM6QdieOmw6q6tqt9OjYbnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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