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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215613a30f0ccd219ae4ca18b39a8229dd0f86aae9871a04e672afb8380c6c7e' 
  AND token = 'EIiuFUEkvVoS4KntIsFczgciAUmhP27mMqsc0YdyGB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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