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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e135bdd116268273f28e6f3aefd3e5f19bc4c7010001a4c33a74a7eeb20170f' 
  AND token = '/NRm/UKT54Kgimx4fFtqO8uYz02XY56Ccfvghmmtutk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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