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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f344c1c9e4bf6f9a0404bbadbfca9202b68f9d026b1785902e0c07d567f1f4' 
  AND token = 'idmfWv3URfSqW1VDBlvAWVF/oiFdHZAIzmWBmf5PNN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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