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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f364c921ef2b40f6ba182cce99af99c5bb63d057d2c8304e6c18d936086110b' 
  AND token = 'MK7ikBnaeye3qLbMM2kDEEmivKqzr63YTWocCJfeEkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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