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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e806dfebcd70a91cb46945a59fbad90548161c1a7a7060d06407a04d07660764' 
  AND token = 'vZcdPezfbYEPpfokWxQdv0y9+3pbT278T3xh+DmtKFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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