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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd61f161fbd9aa6905ed51135d2ed122067c91ad5ed514b591d7d67438da7d9' 
  AND token = 'IpCfLpSebiKkelJ/FuL9mbX+I10KCZfYsnYVCBSsekc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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