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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1a55386ec4e19dfce88a717c7cd95adaf5b66317aaa41ec2a1a1fef32a747a' 
  AND token = 'EBPT9rmwxyk2TpxpZ4xlFU2CKyijSA9a1m2JjZrPa5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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