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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5f9ec7b6cd668e6a57d171f83379e85c751180c0336288d14a558925e8df89' 
  AND token = 'h1MI6JUUM0/rdKvz7AoiM9Imibide20eubopKvKppnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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