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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14eedc4b7903270168ba300446d44d024168a59ca51fb393a2331e5e610a06a1' 
  AND token = 'Cuil3+SdWjxMQJChma2A24+ztqlocxioMjjd5UWL2L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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