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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7de72b61e68145e3e1c20f515290bab28f6e31a92acb69289acc2f8cb22f3b' 
  AND token = '+bon4tA8UI6RyJb2AQWOtyEDyJdfjY795t1/IOmTizY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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