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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09eba987c2620256fc373e5f5ddc5b484c7ef57dba84b15e09969c401ba1180' 
  AND token = 'CNe5J64Keiuj7RtohHwaLzrYzIhggBO9LOscc34XRVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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