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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47da9b99b4ad903cd48639d313fc7504cb1a4a26bb3ed04dc09be9d740b11236' 
  AND token = '5Ja8VHZdeekEs4iwKbOSUdAMbNiC8JnLagIPl1gMgBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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