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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555bacd900914f2536d77e3566f88c80e9c902f77d5d67f4cb4c10fc87581dc0' 
  AND token = 'X3MHmz33cLR1ZpCtabU4x6LJ+8hyWGF184nbvm1TAsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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