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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf992da8823e41bcb2155aeeb7e3d775b635295a47cffed5e61c20cef7c4efff' 
  AND token = '9di3NSP2CF44vg76kGhEUXN82KhqxVPQ0crZjz5rIhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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