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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be3108c8b4270813f344135178d2caf492fffb59aaf28d486b261a5ddf523fa' 
  AND token = '3P5wuHXdEQnaIqJTv7n+Djq47aM/OJKU2dML9OF49Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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