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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4263d9a4b2f3425beb7887191576cf4d4aa326ed301d8b24a0f903fc7912daa9' 
  AND token = '48aAlJ9mLWuaooEqiLXUp/GysNWOQ0DIwInvX6b+d0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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