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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa00c58ae7a293e20a73fa8e855fcd2df99577b2a4877a6ec069fa879f40630' 
  AND token = 'b1JqCSGV+xQnnFkkVvm5WFvZC1wqkighoehMTJVdIL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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